/*
  Copyright 2011 Keith E. Laidig

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 */
package org.aimj.tools;
import org.aimj.tools.*;
public class dAF extends AF {
    private Integer term1;  // the first angular momentum term
    private Integer term2;  // the second angular momentum term

    public dAF(Centre origin, Double expon, Integer term1, Integer term2) {
        super(origin, expon);
	this.term1 = term1;
	this.term2 = term2;
    }
    private final Double TWO = 2.0;
    // determine value of PSI
    public Double getBFValue(Centre position) {
        return (position.getL(term1) - origin.getL(term1)) 
             * (position.getL(term2) - origin.getL(term1)) 
             * Math.exp(-expon*origin.distanceSquared(position));
    }
}
